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https://hku.hk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
22
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
77
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.42 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

84.40 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

872 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.266

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

15.57 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

84.42 s

Page Load Progression

1.4 s
2.8 s
4.2 s
5.6 s
7.0 s
8.4 s
9.8 s
11.2 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
40.6 MB transferred, 114 requests
FIX
40.6 MB transferred, 114 requests
Critical::
Page weighs 41.3 MB (40.6 MB transferred)
Warning::
Images are 39.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 39.1 MB
Warning::
JavaScript is 904 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 904 KB
Info::
CSS is 322 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 322 KB
Info::
Fonts are 220 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 220 KB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 8.5 g CO2 per page load
40.6 MB / 2.4 MB budget
40.6 MB transferred
114 requests
8.5 g CO2 per page load
Images 39.1 MiB 96%
JavaScript 904.2 KiB 2%
CSS 322.3 KiB 1%
Fonts 220.2 KiB 1%
HTML 95.3 KiB 0%
Other 15.4 KiB 0%
Other 953 B 0%
Other 552 B 0%
Other 543 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
9279ms total JS execution
FIX
9279ms total JS execution
Warning::
https://hku.hk/: 4526ms CPU time
Warning::
https://hku.hk/assets/js/index.js?t=20230414: 2173ms CPU time
Warning::
Unattributable: 1767ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-M9F...: 233ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ZHLL...: 172ms CPU time
Info::
Third-party scripts: 2324ms (25% of total)

Main Thread Breakdown

Other 43% Style & Layout 20% Script Evaluation 19% Rendering 12% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://hku.hk/4526ms17ms6ms1st
https://hku.hk/assets/js/index.js?t=202304142173ms1059ms30ms1st
Unattributable1767ms71ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M9F2TJ6233ms170ms49ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZHLLDTLTMG&cx=c&gtm=4e64h1172ms128ms41ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js152ms125ms21ms3rd
https://hku.hk/assets/js/slide/banner.js?t=20230414140ms104ms2ms1st
https://hku.hk/assets/js/main.min.js?t=20230414115ms56ms4ms1st
D
JS Bundles
Action
13 scripts, 344 KB unused
FIX
13 scripts, 344 KB unused
Warning::
https://hku.hk/assets/js/index.js?t=20230414: 172 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M9F...: 69 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZHLL...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 344 KB
344 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://hku.hk/assets/js/index.js?t=20230414355 KB172 KB (48%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-M9F2TJ6135 KB69 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-ZHLLDTLTMG&cx=c&gtm=4e64h1157 KB66 KB (42%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://hku.hk/assets/min/js/menu.js?t=2023041435 KB—✓1st
https://ssl.google-analytics.com/ga.js17 KB—✓3rd
https://hku.hk/assets/js/device.min.js?t=202304144 KB—✓1st
https://static.hotjar.com/c/hotjar-1966860.js?sv=76 KB—✓3rd
https://hku.hk/assets/js/high-contrast.js?t=202304142 KB—✓1st
https://hku.hk/assets/min/js/mobile_menu.js?t=2023041469 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
88 images, 0 KB saveable
REVIEW
88 images, 0 KB saveable
Warning::
https://hku.hk/f/banner/28942/258c90/mahkcs-hku-ba... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/f/banner/28939/258c90/30th%20HKMF_W... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/assets/img/cad-27th.png?t=20210628 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/f/banner/28843/258c90/HKUsmallBanne... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/f/banner/331/258c90/uv_banner_350x1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/f/banner/14717/258c90/bannerSPACE@7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/f/banner/27503/258c90/Untitled%20de... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/assets/img/WARS-Triple-Gold-hku-col... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/assets/img/besthk-logo-2016.png?t=2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hku.hk/assets/img/2014_Standard_Winner.png... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
88 images 39.1 MB
0 oversized -0 KB
87 legacy format
10 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Page Weight Inventory
Action
114 resources · 40.6 MB · 344 KB savings available
REVIEW
114 resources · 40.6 MB · 344 KB savings available
Warning::
Page weight 39.6 MB over 1MB target
Got: 40.6 MB Expected: ≤ 1 MB
Info::
~344 KB of savings available
Info::
9 third-party resources (1% of weight)
Info::
42 resources over 200KB
114 resources · 40.6 MiB · 9 third-party 39.6 MiB over 1MB target
Image 96% · 39.1 MiB
JavaScript 2% · 904.2 KiB
CSS 1% · 322.3 KiB
Font 1% · 220.2 KiB
Document 0% · 95.3 KiB
Other 0% · 2.0 KiB

~344.2 KiB of savings available

Remove unused JavaScript: 344.2 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (374.8 KiB of 40.6 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
6 fonts (220 KB)
PASS
6 fonts (220 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

220 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s 70.0 s 72.0 s 74.0 s 76.0 s 78.0 s 80.0 s 82.0 s 84.0 s 86.0 s 88.0 s FCP 5.4 s LCP 84.4 shttps://hku.hk/assets/fonts/roboto-regular-webfont.woff2roboto-regular-webfont.... https://hku.hk/assets/fonts/roboto-regular-webfont.woff2 — 65.0 KiB — 1.2 s — font-display: swaphttps://hku.hk/assets/fonts/roboto-medium-webfont.woff2roboto-medium-webfont.w... https://hku.hk/assets/fonts/roboto-medium-webfont.woff2 — 65.9 KiB — 1.2 s — font-display: swaphttps://hku.hk/assets/fonts/icomoon/fonts/wico.woff2wico.woff2 https://hku.hk/assets/fonts/icomoon/fonts/wico.woff2 — 4.9 KiB — 708 ms — font-display: swaphttps://hku.hk/assets/fonts/frankruhllibre-bold-webfont.woff2frankruhllibre-bold-web... https://hku.hk/assets/fonts/frankruhllibre-bold-webfont.woff2 — 24.3 KiB — 982 ms — font-display: swaphttps://hku.hk/assets/fonts/frankruhllibre-medium-webfont.woff2frankruhllibre-medium-w... https://hku.hk/assets/fonts/frankruhllibre-medium-webfont.woff2 — 23.7 KiB — 1.2 s — font-display: swaphttps://hku.hk/assets/fonts/frankruhllibre-black-webfont.woff2frankruhllibre-black-we... https://hku.hk/assets/fonts/frankruhllibre-black-webfont.woff2 — 36.4 KiB — 341 ms — font-display: swap
roboto-regular-webfont.... woff2 swap
Size 65 KB
Load time 1.2 s
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
roboto-medium-webfont.w... woff2 swap
Size 66 KB
Load time 1.2 s
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
wico.woff2 woff2 swap
Size 5 KB
Load time 708 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
frankruhllibre-bold-web... woff2 swap
Size 24 KB
Load time 982 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
frankruhllibre-medium-w... woff2 swap
Size 24 KB
Load time 1.2 s
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
frankruhllibre-black-we... woff2 swap
Size 36 KB
Load time 341 ms
Start 5.5 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
114 requests over 11658ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s 70.0 s 72.0 s 74.0 s 76.0 s 78.0 s 80.0 s 82.0 s 84.0 s 86.0 s 88.0 s FCP 5.4 s LCP 84.4 shttps://hku.hk// https://hku.hk/ — 200 — 95.3 KiB — 1.5 s — http/1.1https://hku.hk/assets/css/index.css?t=20230414/assets/css/index.css?t=20230414 https://hku.hk/assets/css/index.css?t=20230414 — 200 — 320.3 KiB — 1.3 s — http/1.1https://hku.hk/assets/js/device.min.js?t=20230414/assets/js/device.min.js?t=20230414 https://hku.hk/assets/js/device.min.js?t=20230414 — 200 — 3.9 KiB — 747 ms — http/1.1https://hku.hk/assets/js/high-contrast.js?t=20230414/assets/js/high-contrast.js?t=20230... https://hku.hk/assets/js/high-contrast.js?t=20230414 — 200 — 1.9 KiB — 768 ms — http/1.1https://hku.hk/assets/img/hku-115.svg?t=1760950144/assets/img/hku-115.svg?t=176095014... https://hku.hk/assets/img/hku-115.svg?t=1760950144 — 200 — 92.9 KiB — 1.3 s — http/1.1https://hku.hk/assets/img/manifest.json/assets/img/manifest.json https://hku.hk/assets/img/manifest.json — 200 — 953 B — 994 ms — http/1.1https://hku.hk/f/frontpage/29052/3840c2160/260318_Website_3_Banner_CurrentV_3_EN.jpg/f/frontpage/29052/3840c2160/260318... https://hku.hk/f/frontpage/29052/3840c2160/260318_Website_3_Banner_CurrentV_3_EN.jpg — 200 — 1.0 MiB — 1.8 s — http/1.1https://hku.hk/f/frontpage/29052/3840c2160/SGP%20Inaugural%20Week%201.png/f/frontpage/29052/3840c2160/SGP%20... https://hku.hk/f/frontpage/29052/3840c2160/SGP%20Inaugural%20Week%201.png — 200 — 4.1 MiB — 1.5 s — http/1.1https://hku.hk/f/frontpage/29052/3840c2160/260119_THE_Subject_Ranking_2026-07.jpg/f/frontpage/29052/3840c2160/260119... https://hku.hk/f/frontpage/29052/3840c2160/260119_THE_Subject_Ranking_2026-07.jpg — 200 — 4.5 MiB — 4.7 s — http/1.1https://hku.hk/f/frontpage/29052/3840c2160/260119_THE_Subject_Ranking_2026-08.jpg/f/frontpage/29052/3840c2160/260119... https://hku.hk/f/frontpage/29052/3840c2160/260119_THE_Subject_Ranking_2026-08.jpg — 200 — 4.1 MiB — 2.8 s — http/1.1https://hku.hk/assets/js/index.js?t=20230414/assets/js/index.js?t=20230414 https://hku.hk/assets/js/index.js?t=20230414 — 200 — 355.3 KiB — 2.3 s — http/1.1https://hku.hk/assets/min/js/menu.js?t=20230414/assets/min/js/menu.js?t=20230414 https://hku.hk/assets/min/js/menu.js?t=20230414 — 200 — 34.7 KiB — 2.5 s — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-M9F2TJ6www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-M9F2TJ6 — 200 — 135.4 KiB — 166 ms — h2https://ssl.google-analytics.com/ga.jsssl.google-analytics.com/ga.js https://ssl.google-analytics.com/ga.js — 200 — 17.4 KiB — 109 ms — h2https://hku.hk/f/frontpage/29052/3840c2160/QS-Asia-University-Ranking-2026.jpg/f/frontpage/29052/3840c2160/QS-Asi... https://hku.hk/f/frontpage/29052/3840c2160/QS-Asia-University-Ranking-2026.jpg — 200 — 483.9 KiB — 2.3 s — http/1.1https://hku.hk/f/frontpage/29052/3840c2160/251104_HKU-Highly-Cited-Research_banner.jpg/f/frontpage/29052/3840c2160/251104... https://hku.hk/f/frontpage/29052/3840c2160/251104_HKU-Highly-Cited-Research_banner.jpg — 200 — 334.4 KiB — 1.9 s — http/1.1https://hku.hk/assets/fonts/roboto-regular-webfont.woff2/assets/fonts/roboto-regular-webfon... https://hku.hk/assets/fonts/roboto-regular-webfont.woff2 — 200 — 65.0 KiB — 1.2 s — http/1.1https://hku.hk/assets/fonts/roboto-medium-webfont.woff2/assets/fonts/roboto-medium-webfont... https://hku.hk/assets/fonts/roboto-medium-webfont.woff2 — 200 — 65.9 KiB — 1.2 s — http/1.1https://hku.hk/assets/fonts/icomoon/fonts/wico.woff2/assets/fonts/icomoon/fonts/wico.wo... https://hku.hk/assets/fonts/icomoon/fonts/wico.woff2 — 200 — 4.9 KiB — 708 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
25% of JavaScript execution is third-party
First-party Third-party 2324ms · 349KB · HK$172/mo
Unattributable
Other
Costly
Execution 1767ms
Transfer 0 KB
Monthly Cost HK$131/mo
Google Tag Manager
Tag Manager
Costly
Execution 233ms
Transfer 135 KB
Unused 51%
Monthly Cost HK$17/mo
Google Tag Manager
Tag Manager
Optional
Execution 172ms
Transfer 157 KB
Unused 42%
Monthly Cost HK$13/mo
Hotjar
Session Replay
Optional
Execution 152ms
Transfer 57 KB
Unused 67%
Monthly Cost HK$11/mo

These scripts may cost more than they're worth

  • Unattributable adds 1767ms and costs ~HK$131/month
  • Google Tag Manager adds 233ms and costs ~HK$17/month

Unattributable takes 1767ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 233ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

51% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

67% of Hotjar's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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